MyCustomUnwindSegue_fullcode.m

#import "MyNavController.h"
#import "MyCustomUnwindSegue.h"

@interface MyNavController ()

@end

@implementation MyNavController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (UIStoryboardSegue *)segueForUnwindingToViewController:(UIViewController *)toViewController fromViewController:(UIViewController *)fromViewController identifier:(NSString *)identifier
{
    
    //how to set identifier for an unwind segue:
    
    //1. in storyboard -> documento outline -> select your unwind segue
    //2. then choose attribute inspector and insert the identifier name
    if ([@"UnwindFromSecondView" isEqualToString:identifier]) {
        return [[MyCustomUnwindSegue alloc] initWithIdentifier:identifier source:fromViewController destination:toViewController];
    }else {
        //if you want to use simple unwind segue on the same or on other ViewController this code is very important to mix custom and not custom segue
        return [super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
    }
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end